18. Papaveraceae - Poppy; mostly herbs, sometimes shrubs or trees, often with milky or colored latex; leaves alternate; flowers showy, perfect, calyx of 2-3 distinct, quickly falling sepals, corolla of 4-6 or 8-12 biseriate, crumpled, separate petals; numerous stamens, 2- to several united carpels; fruit a capsule opening by valves or pores.